diff options
| -rw-r--r-- | llvm/include/llvm/Support/Error.h | 7 | ||||
| -rw-r--r-- | llvm/unittests/Support/ErrorTest.cpp | 6 |
2 files changed, 13 insertions, 0 deletions
diff --git a/llvm/include/llvm/Support/Error.h b/llvm/include/llvm/Support/Error.h index 3eb254cbc51..f96e02ca790 100644 --- a/llvm/include/llvm/Support/Error.h +++ b/llvm/include/llvm/Support/Error.h @@ -143,6 +143,13 @@ public: /// constructor, but should be preferred for readability where possible. static Error success() { return Error(); } + /// Create a 'pre-checked' success value suitable for use as an out-parameter. + static Error errorForOutParameter() { + Error Err; + (void)!!Err; + return Err; + } + // Errors are not copy-constructable. Error(const Error &Other) = delete; diff --git a/llvm/unittests/Support/ErrorTest.cpp b/llvm/unittests/Support/ErrorTest.cpp index 893bd6825bf..1a0dd441c1a 100644 --- a/llvm/unittests/Support/ErrorTest.cpp +++ b/llvm/unittests/Support/ErrorTest.cpp @@ -105,6 +105,12 @@ TEST(Error, UncheckedSuccess) { } #endif +// Test that errors to be used as out parameters are implicitly checked ( +// and thus destruct quietly). +TEST(Error, ErrorAsOutParameter) { + Error E = Error::errorForOutParameter(); +} + // Check that we abort on unhandled failure cases. (Force conversion to bool // to make sure that we don't accidentally treat checked errors as handled). // Test runs in debug mode only. |
